{"title":"Thermal Treatments and Characteristics Study On Unalloyed Structural (AISI 1140) Steel","authors":"S. S. Sharma, P. R. Prabhu, Rajagopal Chadaga","volume":46,"journal":"International Journal of Mechanical and Mechatronics Engineering","pagesStart":1072,"pagesEnd":1078,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/11811","abstract":"
The main emphasis of metallurgists has been to process the materials to obtain the balanced mechanical properties for the given application. One of the processing routes to alter the properties is heat treatment. Nearly 90% of the structural applications are related to the medium carbon an alloyed steels and hence are regarded as structural steels. The major requirement in the conventional steel is to improve workability, toughness, hardness and grain refinement. In this view, it is proposed to study the mechanical and tribological properties of unalloyed structural (AISI 1140) steel with different thermal (heat) treatments like annealing, normalizing, tempering and hardening and compared with as brought (cold worked) specimen. All heat treatments are carried out in atmospheric condition. Hardening treatment improves hardness of the material, a marginal decrease in hardness value with improved ductility is observed in tempering. Annealing and normalizing improve ductility of the specimen. Normalized specimen shows ultimate ductility. Hardened specimen shows highest wear resistance in the initial period of slide wear where as above 25KM of sliding distance, as brought steel dominates the hardened specimen. Both mild and severe wear regions are observed. Microstructural analysis shows the existence of pearlitic structure in normalized specimen, lath martensitic structure in hardened, pearlitic, ferritic structure in annealed specimen.<\/p>\r\n","references":"[1] Sarwar M, Priestner R., 1996, \"Influence of ferrite-martensite\r\nmicrostructural morphology on tensile properties of dual-phase\r\nsteel\", Journal of Materials Science, Vol 31, pp 2091-2095.\r\n[2] Erdogan M, Priestner R., 2002, \"Effect of martensite content, its\r\ndispersion, and epitaxial ferrite content on Bauschinger behaviour\r\nof dual phase steel\", Journal of Materials Science Technology, Vol\r\n18, pp 369-376.\r\n[3] Anand Prakash Modi, 2007, \"Effects of microstructure and\r\nexperimental parameters on high stress abrasive wear behaviour of\r\na 0.19 wt % Carbon dual phase steel\", Tribology International\r\nJournal, Vol 40, pp 490-497.\r\n[4] Chang P., 1984, \"Temper-aging of continuously annealed low\r\ncarbon dual phase steel\", Metal Transformation, Vol15A, pp 73-\r\n86.\r\n[5] Gunduz S, Demir B, Kacar R., 2008, \"Effect of aging temperature\r\nand martensite by volume on strain aging behaviour of dual phase\r\nsteel-, Iron making and Steel making, Vol 35, pp 63-68.\r\n[6] Yan-qiu Zia, Wei-min Liu & Qun-Ji Xue, 2005, \"Comparative\r\nstudy of the tribological properties of various modified mild steels\r\nunder boundary lubrication condition\", Journal of Wear, Vol 38,\r\npp 508-514.\r\n[7] Anijdan SHM, Vahdani H., 2005, \"Room-temperature mechanical\r\nproperties of dualphase steels deformed at high temperatures\",\r\nMaterials Letter, Vol 59, pp 1828-1830.\r\n[8] Pradeep L Menezes, Kishore, & Satish V Kailas, 2006, \"Influence\r\nof surface texture on coefficient of friction and transfer layer\r\nformation during sliding of pure Mg pin on EN 8 steel plate\",\r\nJournal of Wear, Vol 261, pp 578-591.\r\n[9] Suleyman gunduz & Atilla Torun, 2008, \"Influence of straining\r\nand aging on the RT mechanical properties of dual phase steel\",\r\nJournal of materials & DSN, Vol 29, pp 1914-1918.\r\n[10] Abdalla AJ, Hein LRO, Pereira MS, Hashimoto TM., 1999,\r\n\"Mechanical behaviour of strain aged dual phase steels\", Materials\r\nScience Technology, Vol 15, pp 1167-70.\r\n[11] Sun S, Pugh M., 2002, \"Properties of thermo mechanically\r\nprocessed dual-phase steels containing fibrous martensite\", Mater\r\nScience Engineering A, Vol 335, pp 298-308.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 46, 2010"}